[clang] [Clang][C++23] Core language changes from P1467R9 extended floating-point types and standard names. (PR #78503)

[via cfe-commits]

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@@ -7444,9 +7444,11 @@ isArithmeticArgumentPromotion(Sema &S, const ImplicitCastExpr *ICE) {
     From = VecTy->getElementType();
   if (const auto *VecTy = To->getAs<ExtVectorType>())
     To = VecTy->getElementType();
-  // It's a floating promotion if the source type is a lower rank.
-  return ICE->getCastKind() == CK_FloatingCast &&
-         S.Context.getFloatingTypeOrder(From, To) < 0;
+  // It's a floating promotion if the source type is float.
+  // [7.3.8p1][conv.fpprom] https://eel.is/c++draft/conv.fpprom
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cor3ntin wrote:

We usually quote the relevant wording rather than adding links

https://github.com/llvm/llvm-project/pull/78503